Difference between revisions of "Pair Spectrometer"

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== Archive of the working drafts for the pair spectrometer proposal.
+
=== Pair spectrometer overview ===
== [http://argus.phys.uregina.ca/gluex/DocDB/0011/001128/005/Hall_D_PS_10.doc Pair Spectrometer v10.0 (doc)]
+
[[Image:PairFig.jpg |350px]]
== [http://argus.phys.uregina.ca/gluex/DocDB/0011/001128/003/Hall_D_PS_9.3.doc Pair Spectrometer v9.3] [http://argus.phys.uregina.ca/gluex/DocDB/0011/001128/003/Hall_D_PS_9.3.pdf pdf ]
+
== [http://argus.phys.uregina.ca/gluex/DocDB/0011/001128/002/Hall_D_PS_9.1.3.doc  Pair spectrometer proposal: Version presented to the Sept08 collaboration meeting]
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== [[Media:Hall_D_PS_9.2.pdf|Pair Spectrometer draft 9]] first real Draft to Photon beam group
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== [[Media:Hall_D_PS_7.doc|Pair Spectrometer draft 7]] with Jim's reordering
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== [[Media:Hall_D_PS_6.doc|Pair spectrometer draft 6]] Hrachya's original version
+
  
  
Proposed magnet BNL Type: 30D72.
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==== 18D36 magnet ====
(Power supplies are also available)
+
----
+
  
[[image:30D72.jpg|250px]]
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<gallery>
 +
image:30D72_waterPower.JPG|water power connections
 +
Image:30D72 waterPower2.JPG|Water Power
 +
Image:30D72_TopHalf_ISO.JPG|ISO view
 +
Image:30D72_poleCoil.JPG|Pole
 +
Image:30D72_poleCoil2.JPG|Pole
 +
Image:30D72_bothHalves.JPG|Both halves
 +
Image:30D72_endview_TopHalf.JPG|top half end
 +
Image:30D72_coils1.JPG|coils1
 +
Image:30D72 coils2.JPG|coils2
 +
Image:2012-06-05_07-33-29_980.jpg|Downstream end of the vacuum chamber
 +
Image:2012-06-05_07-33-42_340.jpg|Downstream end of the vacuum chamber
 +
</gallery>
  
== Drawings
+
====GEANT Simulation (old) ====
==[http://argus.phys.uregina.ca/gluex/DocDB/0011/001158/001/d12-m-225-6-1.pdf assembly drawing]
+
Pair Spectrometer's geometry implemented in the GEANT simulation.
  
[[image:30D72_waterPower.JPG | 100px]]
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[[Image:Pair_layout_tdr.jpg |350px]]  
 +
 
 +
The top plot corresponds to the elevation and the bottom plot corresponds to the plan views.
 +
 
 +
-----
 +
Energy resolution of 24 FSF (top) and 6 WSF (bottom) counters estimated with
 +
the GEANT simulation. The converter thickness corresponds to <math> 5x10^{-3} X_0</math>.
 +
The contribution from the beam spot size (~ 4 mm at the converter) to the energy
 +
resolution dominates for the high-energy bins of the WSF counters.
 +
 
 +
[[Image:ps_count_res.jpg |250px]]
 +
 
 +
-----
 +
Photon energy spectrum measured by the pair spectrometer. The plot is obtained by
 +
requiring a coincidence between  the FSF and WSF counters and contains 24 x 6 = 144 energy
 +
bins. The coincident rate corresponds to a high-luminosity run
 +
( <math>10^8</math> photons/sec in the coherent peak ) using Aluminum converter with
 +
the thickness of <math>5 x 10^{-3}</math> radiation lengths.
 +
 
 +
[[Image:ps_rate.jpg |350px]]
 +
 
 +
=== TOSCA simulation ===
 +
 
 +
Pair Spectrometer TOSCA field maps, PS geometry *.opc and and TOSCA result *.op3 files can be found in /u/group/halld/Subsystems/PS/ directory.
 +
 
 +
Read readme.txt and summary.txt files for more details.
 +
 
 +
 
 +
=== Electronics ===
 +
[[Image:PS_Elect.png | 350px| Readout concept]]
 +
 
 +
[[Image:Pair_Readout.gif |750px]]
 +
 
 +
[[Media:Pair_Readout.pdf | Readout electronics]]
 +
 
 +
[[Image:Pair_trigger.gif|750px]]
 +
 
 +
[[Media:Pair_trigger.pdf |Trigger electronics ]]
 +
<br>
 +
<br />
 
----
 
----
 +
 +
=== Pair Spectrometer Converter ===
 +
[https://userweb.jlab.org/~vgr/SUPER%20HARP-November-2011/  Technical drawing of Super Harp ]
 +
 +
=== Old Design ===
 +
 +
== Links up ==
  
 
[http://www.jlab.org/Hall-D/software/wiki/index.php/Photon_Beam Return to Photon Beam Main Page]
 
[http://www.jlab.org/Hall-D/software/wiki/index.php/Photon_Beam Return to Photon Beam Main Page]
  
 
[http://www.jlab.org/Hall-D/software/wiki/index.php/Main_Page Return to Hall-D WIKI main page]
 
[http://www.jlab.org/Hall-D/software/wiki/index.php/Main_Page Return to Hall-D WIKI main page]

Latest revision as of 11:24, 7 June 2018

Pair spectrometer overview

PairFig.jpg


18D36 magnet

GEANT Simulation (old)

Pair Spectrometer's geometry implemented in the GEANT simulation.

Pair layout tdr.jpg

The top plot corresponds to the elevation and the bottom plot corresponds to the plan views.


Energy resolution of 24 FSF (top) and 6 WSF (bottom) counters estimated with the GEANT simulation. The converter thickness corresponds to 5x10^{{-3}}X_{0}. The contribution from the beam spot size (~ 4 mm at the converter) to the energy resolution dominates for the high-energy bins of the WSF counters.

Ps count res.jpg


Photon energy spectrum measured by the pair spectrometer. The plot is obtained by requiring a coincidence between the FSF and WSF counters and contains 24 x 6 = 144 energy bins. The coincident rate corresponds to a high-luminosity run ( 10^{8} photons/sec in the coherent peak ) using Aluminum converter with the thickness of 5x10^{{-3}} radiation lengths.

Ps rate.jpg

TOSCA simulation

Pair Spectrometer TOSCA field maps, PS geometry *.opc and and TOSCA result *.op3 files can be found in /u/group/halld/Subsystems/PS/ directory.

Read readme.txt and summary.txt files for more details.


Electronics

Readout concept

Pair Readout.gif

Readout electronics

Pair trigger.gif

Trigger electronics


Pair Spectrometer Converter

Technical drawing of Super Harp

Old Design

Links up

Return to Photon Beam Main Page

Return to Hall-D WIKI main page